Here we see that Customer Type 1 mean satisfaction score is
significantly below the overall
mean and Customer Type 2 is significantly higher. This is
consistent with the results that were
observed in the ANOVA analysis, but is easier to interpret.

The varying decision limits are due to the varying sample sizes
for each Customer Type, with
smaller sample size giving wider limits in a manner similar to a
control chart. If the data are
balanced the decision limit lines will be constant.